The first plan of the Burtree Pasture Engine Shaft is dated 1899. This one is dated 8-4-1974, but its a copy of an earlier plan:
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As you can see the waterwheels and the gin chamber have yet to be built. In addition, the dashed level which passes close to Moors Sump and the shaft is the low Level in the vein in the Great Limestone. Also note the level mouth not far from the Engine Shaft is that of the Breckonsike High Waggon Level. There might be some evidence of it today in the vicinity of the shaft top. Neither of these were marked on the 1899 plan. What I don't have is the SAMUK/Weardale Minerals abandonment plan which should show the exact location of their incline and workings in the Great limestone, as well as their stopes a short way along Breconsike Day or Water Level. It would also be interesting to find out the actual date of this plan, as well as when the waterwheels and gin chamber were constructed.